Uninterruptible Power Systems, 3-Phase Models

Semi-Annual Service Includes:
1. Perform a temperature scan on all breakers, power connections, fuses and associated controls. Repair and/or report all abnormal readings.
2. Perform a complete visual inspection of the equipment including subassemblies, wiring harnesses, contacts, cables and major components. Check air filters for cleanliness; clean or replace if necessary.
3. Check module(s) completely for the following (if applicable):

  • Rectifier and inverter snubber boards for discoloration.
  • Power capacitors for swelling or leaking of oil.
  • DC capacitor vent caps.

4. Check and evaluate alarm history activity.
5. Record all voltage and current panel meter readings on the module control or the system control cabinet.
6. Measure and record DC bus voltage, ripple voltage and ripple current.
7. Measure and record harmonic trap filter currents.
8. Inspect for proper cooling fan operation.
9. Verify remote monitoring operation, if installed.
10. Inspect general condition of battery plant if not specifically covered under the Maintenance Agreement.
11. Review system performance to address any questions and to schedule any remedial repairs.

Annual Service Includes Above, Plus:
1. Check the inverter and rectifier circuits for burned or broken wires.
2. Check all nuts, bolts, screws and connectors for tightness and heat discoloration.
3. Check fuses on the DC capacitor deck for continuity (if applicable).
4. With customer approval, perform operational test of the system by transferring the critical load to bypass mode.
5. Calibrate and record all electronic control circuits to system specifications.
6. Measure and record all low-voltage power supply levels.
7. Check operation of secondary power supply, if applicable.
8. Adjust power supply output levels as required.
9. Remove dust from circuit cards and other sensitive components and vacuum dust and/or debris from inside the system cabinet.
10. With customer approval, perform operational test of the system by removing input power to the UPS to discharge batteries. Reapply power and verify normal operation has been restored.